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ISBN: 9781260722031

Author: Navidi

Publisher: McGraw-Hill Publishing Co.

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Chapter 9.4, Problem 25E

Interpret calculator display: In a recent poll, people were asked whether they supported an increase in the sales tax. The following display from a TIâ€“84 Plus calculator presents the results of a hypothesis test regarding the proportion of individuals who said they supported an increase in the sales tax.

Chapter 9.4, Problem 25E, Interpret calculator display: In a recent poll, people were asked whether they supported an increase

What are the null and alternate hypotheses?
What is the value of the sample proportion P ^ ?
Can H 0 be rejected at the 0.05 level? State a conclusion.
Someone wants to use these data to test H 0 : p = 0.25 versus H 1 : p ≠ 0.25 . Find the test statistic z and use the method of this section to find the P-value. Do you reject H 0 at the α = 0.05 level? State a conclusion.

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Chapter 9.4, Problem 24E

Chapter 9.4, Problem 26E

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Solution Summary: The author concludes that the null hypothesis is rejected and that less than 50% of people supported an increase in the sales tax at 0.05 significance level.

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